FAIR VALUE MEASUREMENTS (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Jun. 25, 2012	Dec. 31, 2011
Assets:
Total	$ 9,366		$ 62,438
Derivative assets	842		940
Liabilities:
Derivative liabilities	829		217
Debt Instrument, 3.50% Interest Rate, Stated Percentage	3.50%
Debt Instrument, 4.00% Interest Rate, Stated Percentage	4.00%	4.00%
3.50% Convertible Debt, Fair Value Disclosures	3,855
4.00% Convertible Debt, Fair Value Disclosures	87,297
Total amount borrowed as of balance sheet date	85,000	85,000
Notes Payable, Fair Value Disclosure	73,275
Quoted Prices In Active Markets (Level 1) [Member]
Assets:
Total	0		105
Derivative assets	0		0
Liabilities:
Derivative liabilities	0		0
Significant Other Observable Inputs (Level 2) [Member]
Assets:
Total	9,366		62,333
Derivative assets	842		940
Liabilities:
Derivative liabilities	829		217
U.S. government obligations and agency securities [Member]
Assets:
Total	6,829		19,598
U.S. government obligations and agency securities [Member] | Quoted Prices In Active Markets (Level 1) [Member]
Assets:
Total	0		0
U.S. government obligations and agency securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets:
Total	6,829		19,598
U.S. corporate debt [Member]
Assets:
Total	664		25,100
U.S. corporate debt [Member] | Quoted Prices In Active Markets (Level 1) [Member]
Assets:
Total	0		0
U.S. corporate debt [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets:
Total	664		25,100
Foreign government obligations and agency securities [Member]
Assets:
Total			2,810
Foreign government obligations and agency securities [Member] | Quoted Prices In Active Markets (Level 1) [Member]
Assets:
Total			0
Foreign government obligations and agency securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets:
Total			2,810
Foreign corporate debt and equity securities [Member]
Assets:
Total	1,873		14,930
Foreign corporate debt and equity securities [Member] | Quoted Prices In Active Markets (Level 1) [Member]
Assets:
Total	0		105
Foreign corporate debt and equity securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets:
Total	$ 1,873		$ 14,825